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首页> 外文期刊>Industrial Informatics, IEEE Transactions on >Improved Two-Phase Stationary Frame EPLL to Eliminate the Effect of Input Harmonics, Unbalance, and DC Offsets
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Improved Two-Phase Stationary Frame EPLL to Eliminate the Effect of Input Harmonics, Unbalance, and DC Offsets

机译：改进的两相固定帧EPLL，消除了输入谐波，不平衡和DC偏移的影响

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摘要

The effect of input harmonics, unbalance, and dc offsets on the two-phase stationary frame enhanced phase-locked loop (αβ-EPLL) is theoretically analyzed first. It indicated that the nonideal grid conditions cause the periodic ripples in the estimated amplitude, frequency, and phase angle. An improved αβ-EPLL by introducing two pure integrators and moving average filter (MAF) into both the amplitude and frequency estimation loops of αβ-EPLL is proposed to eliminate the effect of the aforementioned nonideal grid conditions. An improved implementation of MAF to eliminate the effect of the variation of the grid frequency is proposed as well. The linear model of the improved αβ-EPLL is built and the design rule of the control parameters is determined. Detailed experimental results are presented to verify the validity and feasibility of the improved αβ-EPLL.
机译：首先从理论上分析了输入谐波，不平衡和直流偏移对两相固定框架增强锁相环（αβ-EPLL）的影响。这表明非理想的网格条件会导致估计的幅度，频率和相位角出现周期性波动。通过将两个纯积分器和移动平均滤波器（MAF）引入到αβ-EPLL的幅度和频率估计环路中，提出了一种改进的αβ-EPLL，以消除上述非理想电网条件的影响。还提出了一种改进的MAF实施方案，以消除电网频率变化的影响。建立了改进的αβ-EPLL的线性模型，并确定了控制参数的设计规则。给出了详细的实验结果，以验证改进的αβ-EPLL的有效性和可行性。

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